JPH10177285A - Color print and method and device for forming color print - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily obtain a color print having an image with gloss and texture by fixing a toner image for a color image on a transparent film, in a mirror image state and a white toner layer on the whole of the surface where the toner image is fixed to the transparent film. SOLUTION: On the film 4, the toner image 41 corresponding to the color image of an original is formed in the mirror image state by a transfer electrifier and further, the white toner layer 42 is formed with a uniform density, to cover the whole surface having the toner image 41 and then, heated by a fixing unit. Then, the toner image 41 and the toner layer 42 are melted and fixed on the film 4, to be ejected as a print. Therefore, when the film 4 is viewed from a side opposite to the surface where the toner image 41 and the toner layer 42 are fixed, the color image of a color original is copied as an erecting image and coated with the white toner layer 42 as a back, so that the color image excellent in the gloss, etc., can be obtained with a white background.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a color print by electrophotography, a method of forming the same, and a forming apparatus.

[0002]

2. Description of the Related Art In an electrophotographic color copying machine or a color printing apparatus, generally, a latent image is developed with yellow, magenta, cyan and black toners, and the latent image is transferred and fixed on paper to perform color printing. (Color copy). However, in the color print obtained in this way, it is difficult to give gloss and texture to the image.

Therefore, the paper on which the color image is fixed is
In addition, a light reflection layer is provided on the surface of an image by thermocompressing the laminated film while being sandwiched by a laminate film, so that the image has gloss and texture.

As disclosed in Japanese Patent Laid-Open Publication No. Hei 3-50586, a color image is mirror-copied on a transparent film such as an OHP film, and paper is adhered to the copy surface using a spray paste. There is also a way to see from the other side. Further, in the field of printing, there is a method of printing a color image on a transparent film and uniformly printing white ink on the entire printing surface.

[0005]

However, in the case of the method using a laminated film, a laminating apparatus is required, and there are problems in terms of cost and processing time. Further, since the paper is sandwiched between the laminate films from both sides, the thickness is limited.

Further, the method of gluing a sheet to a copy surface requires a lot of work. In addition, there is a drawback that image unevenness and adhesive peeling easily occur due to adhesive unevenness.

Further, the method of printing white ink on a transparent film is a similar processing method if a color copying machine or a color printing apparatus is an ink jet method, so that it can be applied. However, printing on film, compared to printing on paper, uses dampening water significantly different,
Printing itself requires special skills and know-how and is not common. Therefore, when the color copying machine or the color printing apparatus uses the electrophotographic method, it is impossible to print the white ink on the transparent film, considering that the processing method is different.

SUMMARY OF THE INVENTION The present invention solves the above problems and makes it possible to easily obtain a color print having gloss and texture in an image.

[0009]

Therefore, in the present invention, when the reference numerals of the respective parts correspond to the embodiments described later, the toner image 41 of the target color image is obtained in the color print which is the output result. The toner image 41 is fixed to the transparent film 4 in a mirror image state by electrophotography, and the white toner layer 42 is fixed to the entire surface of the transparent film 4 on which the toner image 41 is fixed.

When a color print is to be obtained, a toner image 41 of a target color image is formed on the transparent film 4 in a mirror image state by electrophotography, and white toner is applied to the toner image on the transparent film 4. The toner image 41 and the toner layer 42 are transferred to the entire surface of the surface on which the surface 41 is formed, and the toner image 41 and the toner layer 42 are fixed on the transparent film 4.

Further, as the apparatus, means 31, 32, 33, 3 for forming a toner image 41 of a target color image on the transparent film 4 in a mirror image state by electrophotography.
6, 37, 39, and means 31, 32, 33, 36, 37 for transferring the white toner as a toner layer 42 over the entire surface of the transparent film 4 on which the toner image 41 is formed;
Means 38 for fixing the toner image 41 and the toner layer 42 to the transparent film 4.

[0012]

When the transparent film 4 is viewed from the opposite side of the toner image 41 and the toner layer 42, a target color image is drawn by the toner image 41,
The color image is back-coated with a white toner layer 42. Then, the toner layer 42 provides a background.

[0013]

FIG. 1 shows an example in which the present invention is applied to an electrophotographic color copying machine. That is, the color document 1 is read by the document reading unit 10 to extract red, green, and blue signals R, G, and B, and these signals RB are converted to an image processing unit 20 described later.
, And yellow, magenta, cyan, and black drawing data YO, MO, CO, and KO are generated, and these drawing data YO to KO are supplied to the image forming unit 30 in a frame sequential manner.

In the image forming section 30, the photosensitive drum 31 is charged by a charger 32 for forming an electrostatic latent image. Then, the drawing data from the image processing unit 20 is supplied to the laser scanner 39 to modulate the output laser light, and the laser light is used to modulate the photosensitive drum 3.
1 is scanned to form an electrostatic latent image on the drum 31.
In this case, the modulation of the laser beam by the image data and the scanning of the laser beam are performed so that the latent image becomes a normal image on the drum 31 when viewed from the laser beam, that is, the color image is finally obtained on the transfer-receiving body. Are modulated and scanned such that is a mirror image.

Further, the rotary developing device 33 includes yellow, magenta, cyan, black and white developing devices 33Y, 3Y.
It has 3M, 33C, 33K, 33W. In the paper tray 34, a transparent film 4 such as an OHP film is prepared as an object to be transferred.

The developing devices 33Y to 33Y of the rotary developing device 33
Of the 33K, a developing device of a color corresponding to the latent image on the drum 31 is selected, toner is supplied from the selected developing device to the drum 31, and the latent image on the drum 31 is converted into a toner image. Subsequently, the transparent film 4 is conveyed from the paper tray 34 to the transfer drum 36 by the paper feeding device 35, and the corona discharge is applied from the back surface of the film 4 by the transfer charger 37, so that the toner image on the drum 31 is transferred to the film 4. Is transferred to Thus, first, the first color toner image is formed on the transparent film 4 in a mirror image state.

The formation of the latent image, the formation and transfer of the toner image are sequentially performed for each of yellow, magenta, cyan, and black. For example, as shown in the cross section in FIG. A color toner image 41 corresponding to one color image is formed.

Subsequently, particularly in the present invention, the photosensitive drum 31 is charged to a uniform level by the charger 32,
Next, this photosensitive drum 31 is
And the area corresponding to the original 1 on the photosensitive drum 31 is turned into a latent image of a uniform level.

Further, the developing device 33W is selected and white toner is supplied to the drum 31, and the latent image on the drum 31 is converted into a toner image. In this case, since the area of the photosensitive drum 31 corresponding to the document 1 has been a latent image of a uniform level, the converted toner image has a uniform density in the area corresponding to the document 1. Is a white toner layer formed on the substrate. Then, the white toner layer is transferred to the film 4 by the transfer charger 37, and thereafter, the toner image is transferred to the film 4 by the transfer charger 37.

Therefore, as shown in FIG. 2, a toner image 41 corresponding to the color image of the original 1 is formed on the film 4 in a mirror image state, and further, with a uniform density so as to cover the entire surface. This means that the white toner layer 42 is formed.

Subsequently, the film 4 on which the toner image 41 and the toner layer 42 are formed is conveyed to the fixing device 38 and heated, so that the toner image 41 and the toner layer 42 are dissolved and fixed to the film 4. Then, this toner image 4
1 and the film 4 to which the toner layer 42 is fixed are carried out as a printing result.

Therefore, the unloaded film 4
Is viewed from the side opposite to the fixed surface of the toner image 41 and the toner layer 42, the color image of the color original 1 is copied as a normal image, and the color image is backed up by the white toner layer 42. Since it is coated, it is possible to obtain a color image with white as a background color and excellent gloss and texture.

In this case, since the background of the color image is formed by the toner layer 42, a dedicated device such as a laminating device is not required, and the cost and processing time are reduced. And never change.
In addition, there is no need for the trouble of gluing blank paper. In addition, there is no occurrence of image unevenness or adhesive peeling due to adhesive unevenness.

Further, the toner layer 42 serving as the background of the color image can be formed by the color copying apparatus in the same manner as the original color image, and a special technique is required as compared with the method of printing white ink as the background of the color image. No need for know-how.

Further, as shown in FIG. 3, for example, the film 4 can be illuminated by a lamp 5 from behind the toner image 41 and the toner layer 42. In this case, a beautiful display type color image can be obtained. it can.

FIG. 4 shows a circuit example of the image processing section 20.
The image processing section 20 has basically the same configuration as an image processing circuit of a general color copying apparatus. That is, the red signal, the green signal, and the blue signal R, G, and B from the document reading unit 10 are supplied to the color conversion circuit 21 and the image data L *, a *, and b represented in the L * a * b * space. * Is converted to
The image data L * to b * are supplied to the inverse color conversion circuit 22 and are converted into yellow, magenta, cyan and black image data Y, M, C and K. At this time, the image data Y to K are adjusted by adjusting the inking adjustment unit 221.
Is changed to adjust the inking level of the finally obtained color image.

Then, the image data Y to K are supplied to the dot area ratio conversion circuit 23, and the dot area ratio color image data Y
%, M%, C%, and K%, and these data Y% to K% are supplied to the screen generator 24 and buffered in a memory. The buffered signals Y% to K% are converted into PWM signals YO, MO, CO, and KO in which the pulse width changes in a color-sequential manner and for each pixel, corresponding to the density of each color in the pixel. The signals YO to KO are supplied to the image forming section 30 in color order as yellow, magenta, cyan and black drawing data, and the toner image of the original 1 is placed on the transparent film 4 as shown in FIG. 41 are formed.

Subsequently, the photosensitive drum 31 is charged to a uniform level by the charger 32, and then the white signal control circuit 25
Supplies predetermined image data WO to the image forming unit 30, and an area of the photosensitive drum 31 corresponding to the original 1 is
The latent image is of a uniform level. At this time, a signal indicating the area of the original 1 is supplied from the original reading unit 10 to the white signal control circuit 25, and the area corresponding to the original 1 is made a latent image of a uniform level.

Further, when the developing device 33W is selected, the latent image on the drum 31 becomes a white toner image of uniform density, that is,
The white toner layer is transferred to the film 4 by the transfer charger 37. Therefore, the toner layer 42 is formed on the film 4 by the white toner layer.

Then, the toner image 41 and the toner layer 42 are fixed on the film 4 by the fixing device 38 as described above, and are output as a copy result. Therefore,
It is back-coated with white toner, and a color print with gloss and texture can be obtained on the image.

In the above description, the present invention is applied to a color copying apparatus. However, the present invention can be applied to a color image forming apparatus such as a color printing apparatus. Color signal R-B
Can be a video signal, an output signal of a personal computer, a film scanner, or the like.

[0032]

According to the present invention, it is possible to obtain a color print having gloss and texture on an image. Moreover,
In that case, a special device is not required, cost and processing are not required, and special techniques and know-how such as when printing on a transparent film are also unnecessary.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of the present invention.

FIG. 2 is a cross-sectional view for explaining the present invention.

FIG. 3 is a cross-sectional view for explaining the present invention.

FIG. 4 is a system diagram showing an example of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 color original 4 transparent film 10 original reading unit 20 image processing unit 21 color conversion circuit 22 reverse color conversion circuit 23 halftone dot area ratio conversion circuit 24 screen generator 25 white signal control circuit 30 image forming unit 31 photosensitive drum 33 rotating developing device 33C Cyan developing device 33K Black developing device 33M Magenta developing device 33W White developing device 33Y Yellow developing device 36 Transfer drum 38 Fixing device 39 Laser scanner device 41 Toner image 42 Toner layer

Claims (5)

[Claims] 1. A toner image of a target color image is fixed to a transparent film in a mirror image state by electrophotography, and a white toner layer is formed on a surface of the transparent film on which the toner image is fixed. Color print fixed on the entire surface. 2. A toner image of a target color image is formed on a transparent film in a mirror image state by electrophotography, and white toner is applied to the entire surface of the transparent film on which the toner image is formed. A method for forming a color print, wherein the color image is transferred as a toner layer, and the toner image and the toner layer are fixed on the transparent film. 3. A color print forming method according to claim 2, wherein said toner image is formed in accordance with a signal obtained by reading a color original. 4. A means for forming a toner image of a target color image on a transparent film in a mirror image state by electrophotography, and applying a white toner to the entire surface of the transparent film on which the toner image is formed. And a means for transferring the toner image and the toner layer to the transparent film. 5. A color print forming apparatus according to claim 4, further comprising means for reading a color original, wherein said toner image is formed in accordance with a signal read by said reading means. .